<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <button id="btn">get</button>
    <script>
        let = document.querySelector("#btn")
        btn.onclick = function () {
            fetch("http://localhost:3000/api/all")
                .then(res => res.json())
                .then(data => console.log(data))
                .catch(err => {
                    console.log(err)
                })
        }
    </script>

</body>

</html>